In the next column or page – find all choices before answering. 001 (part 1 of 4) 10.0 points a 69 kg man stands on a spring scale in an elevator. starting from rest, the elevator ascends, attaining its maximum speed of 1.5 m/s in 0.85 s. it travels with this constant speed for the next 5.4 s, undergoes a uniform negative acceleration for 2.55 s, and comes to rest. scale what does the spring scale register before the elevator starts to move? the acceleration of gravity is 9.8 m/s 2 . answer in units of n. 002 (part 2 of 4) 10.0 points what does the spring scale register during the first 0.85 s? answer in units of n. 003 (part 3 of 4) 10.0 points what does the spring scale register while the elevator is traveling at constant speed? answer in units of n. 004 (part 4 of 4) 10.0 points what does the spring scale register during the negative acceleration? answer in units of n. 005 10.0 points the magnitude of the vectors f~ is 27 n, the force on the right is applied at an angle 65◦ and the the mass of the block is 26 kg.

Note: the following questions are unrelated to the balmer series or the martian. refer to your course notes. a sun-sized star will spend most of its lifetime as a: white dwarf b. red giant c. protostar d. main-sequence star

Aheat engine running backward is called a refrigerator if its purpose is to extract heat from a cold reservoir. the same engine running backward is called a heat pump if its purpose is to exhaust warm air into the hot reservoir. heat pumps are widely used for home heating. you can think of a heat pump as a refrigerator that is cooling the already cold outdoors and, with its exhaust heat qh, warming the indoors. perhaps this seems a little silly, but consider the following. electricity can be directly used to heat a home by passing an electric current through a heating coil. this is a direct, 100% conversion of work to heat. that is, 19.0 \rm kw of electric power (generated by doing work at the rate 19.0 kj/s at the power plant) produces heat energy inside the home at a rate of 19.0 kj/s. suppose that the neighbor's home has a heat pump with a coefficient of performance of 4.00, a realistic value. note: with a refrigerator, "what you get" is heat removed. but with a heat pump, "what you get" is heat delivered. so the coefficient of performance of a heat pump is k=qh/win. an average price for electricity is about 40 mj per dollar. a furnace or heat pump will run typically 200 hours per month during the winter. what does one month's heating cost in the home with a 16.0 kw electric heater? what does one month's heating cost in the home of a neighbor who uses a heat pump to provide the same amount of heating?

If the new moon happens on january 15th, what shape will it be on february 6th?